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RS7300-33MG Datasheet(PDF) 6 Page - Orister Corporation |
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RS7300-33MG Datasheet(HTML) 6 Page - Orister Corporation |
6 / 11 page Page No. : 6/11 DS‐RS7300‐14 September, 2009 www.Orister.com If the RS7300 uses a SOT‐89 package and this package is mounted on a double sided printed circuit board with two square inches of copper allocated for “heat spreading”, the resulting θJA is 155°C/W. Based on the maximum operating junction temperature 125°C with an ambient of 25°C, the maximum power dissipation will be: W 65 0 155 25 125 T T P CA JC A J MAX . ) ( ) ( = − = + − = θ θ Thermal characteristics were measured using a double sided board with 1”x2” square inches of copper area connected to the GND pin for “heat spreading”. Dropout Voltage A regulator’s minimum input‐output voltage differential, or dropout voltage, determines the lowest usable supply voltage. In battery‐powered systems, this will determine the useful end‐of‐life battery voltage. The RS7300 use a P‐channel MOSFET pass transistor, its dropout voltage is a function of drain‐to‐source on‐resistance RDS(ON) multiplied by the load current. OUT ON DS OUT IN DROPOUT I R V V V × = − = ) ( |
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